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Chemistry 1998 JAMB Past Questions

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16
90.0g of MgCI2 was placed in 50.0cm3 of water to give a saturated solubility of the salt is 8.0 mol dm3 at the same temperature, what is the mass of the salt left undissolved at the given temperature?

(Mg = 24, Cl = 35.5)
  • A. 52.0g
  • B. 58.5g
  • C. 85.5g
  • D. 88.5g
View Answer & Discuss (9) JAMB 1998
17
Soap lather is an example of a colloid in which a?
  • A. liquid is dispersed in gas
  • B. solid is dispersed in liquid
  • C. gas is dispersed in liquid
  • D. liquid is despersed in liquid
View Answer & Discuss (8) JAMB 1998
18
The pH of a solution obtained by mixing 100cm3 of a 0.2M solution of NaOH is?
  • A. 1.3
  • B. 7.0
  • C. 9.7
  • D. 12.7
View Answer & Discuss (23) JAMB 1998
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19
Mg2+(aq) + 2e->(aq) → Mg(s)(volts) = 2.370

Zn2+(aq) + 2e->(aq) → Zn(s)(volts) = -0.763

Cds2+(aq) + 2e->(aq) → Cd(s)(volts) = 0.403

Cu2+(aq) + 2e->(aq) → Cu(s)(volts) = 0.340

In the electrochemical series above, the strongest reducing agents is?
  • A. Cu (s)
  • B. Cd(s)
  • C. Znsub>(s)
  • D. Mg(s)
View Answer & Discuss (10) JAMB 1998
20
2Cl2(g) + 2H2O(g) 4HCl(g) + O2(g)
∆H° = +115KJ mol-1. In the above equilibrium reaction, a decrease in temperature will?
  • A. favour the reverse reaction
  • B. favour the forward reaction
  • C. have no effect on the equilibrium state
  • D. double the rate of the reverse raection
View Answer & Discuss (2) JAMB 1998
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